TY  - JOUR
A1  - Keles, Engin
A1  - Kitzmann, Daniel
A1  - Mallonn, Matthias
A1  - Alexoudi, Xanthippi
A1  - Fossati, Luca
A1  - Pino, Lorenzo
A1  - Seidel, Julia Victoria
A1  - Caroll, Thorsten A.
A1  - Steffen, M.
A1  - Ilyin, Ilya
A1  - Poppenhäger, Katja
A1  - Strassmeier, Klaus G.
A1  - von Essen, Carolina
A1  - Nascimbeni, Valerio
A1  - Turner, Jake D.
T1  - Probing the atmosphere of HD189733b with the Na i and K i lines
JF  - Monthly Notices of the Royal Astronomical Society
N2  - High spectral resolution transmission spectroscopy is a powerful tool to characterize exoplanet atmospheres. Especially for hot Jupiters, this technique is highly relevant, due to their high-altitude absorption, e.g. from resonant sodium (Na i) and potassium (K i) lines. We resolve the atmospheric K i absorption on HD189733b with the aim to compare the resolved K i line and previously obtained high-resolution Na i-D line observations with synthetic transmission spectra. The line profiles suggest atmospheric processes leading to a line broadening of the order of ∼10 km/s for the Na i-D lines and only a few km/s for the K i line. The investigation hints that either the atmosphere of HD189733b lacks a significant amount of K i or the alkali lines probe different atmospheric regions with different temperature, which could explain the differences we see in the resolved absorption lines.
Y1  - 2020
U6  - https://doi.org/10.1093/mnras/staa2435
VL  - 498
IS  - 1
SP  - 1033
PB  - Oxford Univ. Press
CY  - Oxford
ER  -